Hi, any ladies out there with some advice? I'm going to the doctor next week but I'm really nervous about this. I used to have regular periods. But this summer my cycles started getting longer and longer to the point that my last cycle was 48 days long and this one I'm currently in is on day 46, still no signs of a period. What can cause this? I'm afraid of what this could mean. Also, I have taken many pregnancy tests, in fact I took one this morning, results said negative. I've been having consistent (protected) sex with the same man since 2014, so the cycle changes couldn't be related much to sex I wouldn't think. I'm afraid it's more serious.